Chapter 3
Installing a Tape Library Tower Version
3-5
If the tape library is not the last physical device on the SCSI bus, plug a SCSI cable
into an available connector. If the tape library is the last physical device on the SCSI
bus, plug a SCSI cable into the left-end connector and the appropriate SCSI external
terminator into the right-end connector.
If you are connecting the tape library to a single SCSI bus, you must install the SCSI
bus jumper blocks into the middle four connectors. If you are installing the tape
library on all three SCSI buses, the SCSI bus jumper blocks are not needed.
3.5.1
SCSI Buses
You can separate the internal SCSI bus of the tape library into one, two, or three
buses. Each drive and the robotic arm are on an individual bus. You can put the
entire unit on one bus by installing the provided jumper block across the middle
four SCSI connectors on the tape library rear panel.
You should use the single bus for most installations. Other than some fault tolerance
there is no significant advantage to the multiple bus configuration. There is no
throughput advantage to having the internal drives on two buses except in the
extreme case of very un-compressible data when using data compression on the
drives. And, with the multiple bus configuration, control and access by the
applications software can be an issue. You must verify that the your software can
support separating the second drive onto a separate SCSI bus or separate host
system.
If you configure your tape library for multiple SCSI buses, you must order and
install one or more of the appropriate SCSI terminators and SCSI cables and SCSI
bus host adapter cards if not available.
3.5.2
Installing the SCSI Cable
1. Connect a 4-meter SCSI data cable to the tape library.
2. Route the SCSI data cable to the system and connect it to the appropriate host
adaptor card.
You must have an FSB/S or a SBE/S SCSI host adaptor card in your system.
3. Install the SCSI bus jumper blocks to the middle four SCSI ports on the back
panel of the tape library.
4. Install the SCSI regulated terminator if the tape library is the last unit of your
configuration.
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